Hay Barn, attached Corn Barns, and Pigsty at Lower Dyffryn

C19 hay barn is built of rubble stone, with slate roof. W front, lower end was formerly open fronted, now partly infilled with blockwork. Wall plate supported by tall, square stone pillars. Cowhouse (to right) has three large square openings to upper loft, openings to left and right are vertically boarded. Ground-floor has broad open entry to byre; wall (to left) is weatherboarded and with C20 infill. S gable has two tiers of three ventilation slits. Attached at right angles to S gable is the C18 corn barn which is built of uncoursed rubble stone with slate roof. Large off-centre threshing doorways; one door only survives, on S side. Attached to W gable of corn barn is a two bay single-storey pigsty with gabled slate roof. Attached on S side is the C19 corn barn built of thinly coursed rubble stone with hipped corrugated metal roof. Opposing centre doorways to threshing floor have segmental arches with stone voussoirs. Two tiers of two ventilation slits to each of the long walls to left and right. Three tiers of two slits to the S gable end.

C19 hay barn of 7 bays with fine interior: roof trusses have kingposts with angle struts, two tiers of purlins and ridge piece. Transverse stone wall to lofted cowhouse, has square pitching hole and tall blocked 2-light mullion with wooden stanchions (right stanchion missing)). Hay barn E wall has stone base with four splayed ventilation slits and above horizontal boarded timber framed panels. Adjoining E wall to lower cowhouse has three square openings with boarded shutters. C18 barn of four bays has raking queen strut trusses and two tiers of purlins; barn to S of five bays has C19 trusses.